A 10-year-old girl had urine infections. Her ultrasound
showed two normal kidneys. This is her VCUG.

The film was taken during voiding. The bladder is full
and contrast is seen to travel in retrograde fashion up both
ureters (reflux). Notice that there is no nephrogram (no
contrast in the renal parenchyma). This tells us that this
image was obtained by putting contrast into the bladder, not
by injecting contrast intravenously
(intravenous pyelogram or IVP).